CPC 464; DDI-5; Multiface Two issues

[gmaverick2k]

When I connect my multiface two to the original 464 and attach the DDI-5, it seems the multiface two is incompatible with it. Has anyone got this combination to work? On a side note, the multiface two works with the original 6128 and gotek, however, I prefer the keys on the original 464 and want to have the combination work

[caver99]

could it be because the ddi-5 has 512k, could the extra ram casue as issue with the mf2?